//: polymorphism/music3/Music3.java
// An extensible program.
package polymorphism.music3;

import polymorphism.music.Note;

import static net.mindview.util.Print.*;

class Instrument
{
    void play(Note n)
    {
        print("Instrument.play() " + n);
    }
    
    String what()
    {
        return "Instrument";
    }
    
    void adjust()
    {
        print("Adjusting Instrument");
    }
}

class Wind extends Instrument
{
    void play(Note n)
    {
        print("Wind.play() " + n);
    }
    
    String what()
    {
        return "Wind";
    }
    
    void adjust()
    {
        print("Adjusting Wind");
    }
}

class Percussion extends Instrument
{
    void play(Note n)
    {
        print("Percussion.play() " + n);
    }
    
    String what()
    {
        return "Percussion";
    }
    
    void adjust()
    {
        print("Adjusting Percussion");
    }
}

class Stringed extends Instrument
{
    void play(Note n)
    {
        print("Stringed.play() " + n);
    }
    
    String what()
    {
        return "Stringed";
    }
    
    void adjust()
    {
        print("Adjusting Stringed");
    }
}

class Brass extends Wind
{
    void play(Note n)
    {
        print("Brass.play() " + n);
    }
    
    void adjust()
    {
        print("Adjusting Brass");
    }
}

class Woodwind extends Wind
{
    void play(Note n)
    {
        print("Woodwind.play() " + n);
    }
    
    String what()
    {
        return "Woodwind";
    }
}

public class Music3
{
    // Doesn't care about type, so new types
    // added to the system still work right:
    public static void tune(Instrument i)
    {
        // ...
        i.play(Note.MIDDLE_C);
    }
    
    public static void tuneAll(Instrument[] e)
    {
        for (Instrument i : e)
            tune(i);
    }
    
    public static void main(String[] args)
    {
        // Upcasting during addition to the array:
        Instrument[] orchestra = {new Wind(), new Percussion(), new Stringed(), new Brass(), new Woodwind()};
        tuneAll(orchestra);
    }
} /*
   * Output: Wind.play() MIDDLE_C Percussion.play() MIDDLE_C Stringed.play() MIDDLE_C Brass.play() MIDDLE_C
   * Woodwind.play() MIDDLE_C
   */// :~
